Modelling of solid-liquid extraction process of total polyphenols from soybeans

Abstract

Jokić S., Velić D., Bilić M., Bucić-Kojić A., Planinić M., Tomas S. (2010): Modelling of the process of solid-liquid extraction of total polyphenols from soybeans. Czech J. Food Sci., 28: 206-212.The influence of the solvent, temperature, and extraction time on the extractability of total polyphenols from milled soybeans variety Ika was investigated. The study was performed in order to select the most suitable solvent (water; 50, 60, 70, and 80% aqueous ethanol) for achieving the highest yield of total polyphenols. The most effective solvent (50% aqueous ethanol solution) was used for monitoring the kinetics and modelling of solid-liquid extraction of total polyphenols from soybeans, average particle size 0.459 mm, at solid-liquid ratio of 20 ml/g (ratio of the solvent volume per g of raw material). The total polyphenols content in the soybean extract was determined spectrophotometrically using Folin-Ciocalteu micro-methods at 765 nm. The applicability of different mathematical models (Peleg, Page, and Logarithmic models) to describe the kinetics of the solid-liquid extraction process of total polyphenols from soybeans was studied as well. The results exhibited a significant influence of the solvent and temperature on the kinetics and extraction yield of total polyphenols from soybeans. The best extraction yield of total polyphenols was obtained using 50% aqueous ethanol solution at 80°C after 120 min (4.322 mg GAE/g db ). The extraction yield of total polyphenols in soybean extracts increased by increasing the extraction temperature and extending the duration of the extraction process. The mathematical models applied showed a good agreement with the experimental results, which allows their application in modelling and optimisation of solid-liquid extraction process for the extraction of total polyphenols from soybeans.

Application of aqueous two phase systems based on polyethylene glycol and sodium citrate for the recovery of phenolic compounds from Eucalyptus wood

“…The same trend was observed on the bottom phase. The increase of temperature resulted in most cases in an increase of diffusion rate and solubility of the extracted substances (Jokic et al 2010). On the other hand, temperature had no influence on the recovery yield (Y), which hardly varied with temperature.…”

Roselle Calyces Particle Size Effect on the Physicochemical and Phytochemicals Characteristics

“…Better quantities of phenolics were obtained using a 50:50% ethanol-water ratioand an ET of 30 min. Jokić et al (2010) evaluated the influence of water and ethanol at different concentrations (50, 60, 70, 80%), temperatures (25, 40, 50, 60, 70, 80 °C), and extraction times (5, 10, 15, 20, 30, 40, 60, 90, 120 min) on the extraction of total phenols of soybeans, Ika variety, using an average particle size of 0.459 mm and a liquid-solid ratio of 20 mL/g. The total phenols concentration increased as temperature increased.…”

“…Another important factor is the temperature of extraction. It has been found that increasing the temperature for extraction, up to 80 °C, increases the yields of total phenols in soy extracts using soy powder with an average particle size of 0.459 mm (Jokić et al, 2010). However, the use of temperatures higher than 70 °C for prolonged periods may cause significant degradation of anthocyanins (Cissé, Vaillant, Acosta, Dhuique-Mayer, & Dornier, 2009;Gartaula & Karki, 2010).…”

The estimation of kinetic parameters of the solid-liquid extraction process of the lavender flower (Lavandula x hybrida L.)

“…Kinetic modelling is of great importance for understanding complex diffusion, mass transfer, and thermodynamic parameters affecting extraction (Jurinjak Tušek et al, 2016). The most commonly used empirical model is the Peleg's model for the description of moisture sorption curves (Peleg, 1988), adapted for extraction processes (Bucić-Kojić et al, 2007;Jokić et al, 2010;Piwowarska and González-Alvarez, 2012). Other frequently used models for solid-liquid extraction processes are the modified Page's model (Jokić et al, 2010), the logarithmic model, also known as Elovich's model (Kitanović et al, 2008;Jokić et al, 2010), or the parabolic diffusion model (Kitanović et al, 2008;Piwowarska and González-Alvarez, 2012).…”